unexpected exception starting josm

[flaviolodoli@…]

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-07-23 01:31:06
Last Changed Author: Don-vip
Revision: 5356
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-07-22 22:36:44 +0200 (Sun, 22 Jul 2012)
Last Changed Rev: 5356

Identification: JOSM/1.5 (5356 it)
Memory Usage: 48 MB / 247 MB (22 MB allocated, but free)
Java version: 1.6.0_22, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 7


java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Base64.decodeBase64(Ljava/lang/String;)[B
	at org.openstreetmap.josm.Main.<init>(Main.java:336)
	at org.openstreetmap.josm.gui.MainApplication.<init>(MainApplication.java:69)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:343)
Caused by: java.util.concurrent.ExecutionException: java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Base64.decodeBase64(Ljava/lang/String;)[B
	at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)
	at java.util.concurrent.FutureTask.get(Unknown Source)
	at org.openstreetmap.josm.Main.<init>(Main.java:333)
	... 2 more
Caused by: java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Base64.decodeBase64(Ljava/lang/String;)[B
	at org.openstreetmap.josm.tools.ImageProvider.getIfAvailableImpl(ImageProvider.java:352)
	at org.openstreetmap.josm.tools.ImageProvider.get(ImageProvider.java:254)
	at org.openstreetmap.josm.actions.AddImageryLayerAction.<init>(AddImageryLayerAction.java:31)
	at org.openstreetmap.josm.gui.ImageryMenu.refreshImageryMenu(ImageryMenu.java:96)
	at org.openstreetmap.josm.gui.preferences.imagery.ImageryPreference.initialize(ImageryPreference.java:1039)
	at org.openstreetmap.josm.Main$4.call(Main.java:325)
	at org.openstreetmap.josm.Main$4.call(Main.java:318)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

the error occurs either starting jsom as administrator and user